Jasper's backstory just got a little bit easier to envision. The news broke last week that "Kyle XY" player Kirsten Prout joined the cast of "Eclipse," third movie in the "Twilight" series. She'll play Lucy, a vampire from Jasper Hale's (Jackson Rathbone) past who factors prominently into his coming to terms with joining the ranks of the undead. For those readers out there who aren't as familiar with "Twilight" (all two of you), you can see Jasper being thrown into a grand piano in the "New Moon" trailer below.

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Prout is currently in Vancouver shooting for Lifetime miniseries "Seven Deadly Sins," Bloody Disgusting reports. She'll presumably join director David Slade and the "Twilight" team soon, as the "Eclipse" shoot is currently on in Vancouver.

Beware readers, mild spoilers ahead. Lucy doesn't appear in the present-day telling of "Eclipse," but she'll factor into Jasper's origin-revealing flashback. A former Confederate soldier during the Civil War, Jasper was "born" when he encountered a vampire named Maria (Catalina Sandino Moreno), who enlisted him into her growing vampire army. Jasper ended up turning on his creator, along with two of her soldiers, one of whom is Lucy.

Rathbone has been vocal about his excitement for "Eclipse," which is a more action-heavy opportunity for him. He recently finished work on M. Night Shyamalan's adaptation of "The Last Airbender," which is heavy on the martial arts. The combat he'll engage in for "Eclipse" is quite a bit different, more fitting for the newborn vampire that he is. You can read all of what Rathbone had to say about his more physical role in the third "Twilight" movie in this September interview with MTV's Larry Carroll.